The Ukraine International Airlines flight to Kiev from Tehran crashed on Wednesday hours after Iran fired ballistic missiles at two US military bases in Iraq, and Iranians were on high alert for a US military response.

The Bloc Quebecois, revitalized under new leader Yves-Francois Blanchet, jumped to 32 seats from 10 seats in the predominantly French-speaking province, according to provisional results. Quebec accounts for 78 seats in the House of Commons, second only to Ontario.

"I was proud to work with Justin Trudeau as President," Obama said in a tweet. "He`s a hard-working, effective leader who takes on big issues like climate change. The world needs his progressive leadership now, and I hope our neighbours to the north support him for another term."

"Far too many communities and families are facing terrible tragedies because of gun violence and it is really important that a government show leadership on that," Trudeau told reporters during a campaign stop outside Toronto. Canadians head to the polls on Oct. 21.

With the numbers of shooting incidents rising rapidly in Toronto this summer, Trudeau met with the city`s mayor John Tory as provincial, municipal and federal governments in Canada scrambled to respond to the outbreak of violence.

French President Emmanuel Macron, Canadian Prime Minister Justin Trudeau, Australian Prime Minister Scott Morrison, German Chancellor Angela Merkel, and leaders and senior figures from 10 other countries are also due to attend.